Comparisons of one-volt Josephson-array voltage standards were carried out at the Bureau International des Poids et Mesures. The first set of comparisons was between two BIPM devices, and the second between one BIPM device and one from the Danish Institute of Fundamental Metrology. Two methods were used, one through the calibration of a BIPM-built transfer standard, the other being a direct comparison. The observed discrepancies were within 1 nV.
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Reymann et al. (1991) studied this question.
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